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Electron population properties with different energies in a helicon plasma source

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Plasma Science and Technology 2021年第1期23卷 48-55页

作者： zun zhang Zhe zhang Haibin TANG Jiting OUYANG School of Space and Environment Beihang UniversityBeijing 100191People’s Republic of China Key Laboratory of Space Environment Monitoring and Information Processing of MIIT People’s Republic of China Shanghai Institute of Space Propulsion Shanghai Engineering Research Center of Space EngineShanghai 201112People’s Republic of China School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191People’s Republic of China School of Physics Beijing Institute of TechnologyBeijing 100081People’s Republic of China

The characteristics of electrons play a dominant role in determining the ionization and acceleration processes of *** with electrostatic diagnostics,the optical method is independent of the radio frequency(RF)noise,magnetic field,and electric *** this paper,an optical emission spectroscope was used to determine the plasma emission spectra,electron excitation energy population distributions(EEEPDs),growth rates of low-energy and highenergy electrons,and their intensity jumps with input *** 56 emission lines with the highest signal-to-noise ratio and their corresponding electron excitation energy were used for the translation of the spectrum into *** discrete EEEPD has two clear different regions,namely the low-energy electron excitation region(neutral lines with threshold energy of13–15 eV)and the high-energy electron excitation region(ionic lines with threshold energy?19 e V).The EEEPD variations with different diameters of discharge tubes(20 mm,40 mm,and 60 mm)and different input RF powers(200–1800 W)were *** normalized intensity comparison of the ionic and neutral lines,the growth rate of the ionic population was higher than the neutral one,especially when the tube diameter was less than 40 mm and the input power was higher than 1000 ***,we found that the intensities of low-energy electrons and high-energy electrons jump at different input powers from inductively coupled(H)mode to helicon(W)mode;therefore,the determination of W mode needs to be carefully considered.

关键词： electric propulsion helicon plasma plasma diagnostics optical emission spectroscope electron excitation energy population distribution

Ion engine grids：Function,main parameters,issues,configurations,geometries,materials and fabrication methods

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Chinese Journal of Aeronautics 2018年第8期31卷 1635-1649页

作者： Miguel SANGREGORIO Kan XIE Ningfei WANG Ning GUO zun zhang School of Aerospace Engineering Beijing Institute of Technology Beijing 100081 China National Key Laboratory of Science and Technology of Vacuum Technology and Physics Lanzhou 730000 China

Ion optics are crucial components of ion thrusters and the study of the different ion extraction solutions used since the beginning of the electric propulsion era is essential to understand the evolution of ion engines. This work describes ion engine grids＇ main functions, parameters and issues related to thermal expansion and sputter erosion, and then introduces a review of ion optics used for significant launched and tested ion thrusters since 1970. Configurations, geometries, materials and fabrication methods are analyzed to understand when typical ion thrusters use two or three grids, what are the thicknesses and aperture sizes of the screen, accelerator and decelerator grids, why molybdenum and carbon-based materials such as pyrolytic graphite and carbon–carbon are the best available options for ion optics and what is the manufacturing method for each material.

关键词： Configurations Fabrication methods Ion engine grids Materials Parameters

Surgery for hepatocellular carcinoma with tumor thrombosis in inferior vena cava: A case report

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World Journal of Clinical Cases 2021年第36期9卷 11495-11503页

作者： zun-Yi zhang Er-Lei zhang Bi-Xiang zhang Wei zhang Research Laboratory and Hepatic Surgery Center Department of Hepatic SurgeryTongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430000Hubei ProvinceChina

BACKGROUND Hepatocellular carcinoma(HCC)accompanied by a tumor thrombus is very ***,the treatment strategy is controversial and varies by the location of the *** SUMMARY We report herein a case of HCC with a tumor thrombus in the suprahepatic inferior vena cava(IVC),which was successfully treated by hepatectomy combined with thrombectomy following sorafenib chemotherapy.A 47-year-old woman with chronic hepatitis was diagnosed with *** tomography and magnetic resonance imaging showed that the tumor lesion was located in the right half of the liver,and a tumor thrombus was detected in the suprahepatic IVC near the right *** multi-departmental discussion and patient informed consent,right major hepatectomy and total removal of the tumor thrombus were successfully performed under cardiopulmonary *** were no serious complications after *** sorafenib treatment,no recurrence has been detected so far(11 mo later).CONCLUSION Surgical treatment followed by adjuvant sorafenib therapy might be an acceptable choice for HCC patients with tumor thrombosis in the IVC.

关键词： Hepatocellular carcinoma Tumor thrombosis Inferior vena cava Hepatectomy Thrombectomy Sorafenib Cardiopulmonary bypass Case report

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固-液接触法制备乙烯

化学教育（中英文） 2024年第13期45卷 91-94页

作者：张尊听王丹鹭史亦琳董丽英陕西师范大学化学化工学院陕西西安710119 海南卫生健康职业学院药学系海南海口570311

采用滴液式气体发生器为反应装置,以固体乙烯利和30%氢氧化钾溶液制备乙烯。利用固-液接触法制备乙烯,反应速率可控,无盐析和液泛现象,制气效率达90%以上,并且实验装置体积小、制气量大,为实验室制备乙烯提供了一种简便安全的方法。

关键词：乙烯气体制备滴液式气体发生器固-液接触法

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复杂场景散射特性的参数化仿真模型

制导与引信 2024年第1期45卷 43-52页

作者：张尊牟媛贺新毅曾砾堂北京理工大学北京100081 上海无线电设备研究所上海201109 中国人民解放军第93119部队甘肃酒泉735000

针对复杂场景电磁散射特性的实时仿真需求,提出了一种基于散射中心的散射特性参数化仿真模型。首先基于数字高程数据,利用蒙特卡罗法补充粗糙度信息,构建复杂地形网格模型;再利用双向反射分布函数修正的属性散射中心(bidirectional refl... 详细信息

针对复杂场景电磁散射特性的实时仿真需求,提出了一种基于散射中心的散射特性参数化仿真模型。首先基于数字高程数据,利用蒙特卡罗法补充粗糙度信息,构建复杂地形网格模型;再利用双向反射分布函数修正的属性散射中心(bidirectional reflection distribution function modified attribute scattering center,BRDF-ASC)模型建立参数化仿真模型。数值实验结果表明:所提算法仿真的典型山峰和沙丘地形的雷达散射截面积(radar cross section,RCS)与物理光学(physical optics,PO)法仿真的RCS的均值误差低于3.6 dBsm;与大型海港的实测合成孔径雷达(synthetic aperture radar,SAR)图像进行对比,其参数化散射模型仿真SAR图像的变更检出率为0.1097,验证了所提算法的可行性。

关键词：参数化模型复杂场景双向反射分布函数合成孔径雷达成像

畲药清热化瘀方对肺结核伴空洞患者早期临床疗效及新型炎症标记物的影响

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浙江中西医结合杂志 2024年第1期34卷 44-46页

作者：丰银平郭净张尊敬浙江中医药大学附属丽水中医院结核病科丽水323000

结核病是全球关注的重大公共卫生问题之一,也是由单一感染因素引起死亡最多的疾病,2021年全球约有新发结核病例1000万人,因结核病死亡150万余人,其中80%以上为肺结核^([1])。肺结核被定义为由结核分枝杆菌感染肺部引起的慢性感染性疾病... 详细信息

结核病是全球关注的重大公共卫生问题之一,也是由单一感染因素引起死亡最多的疾病,2021年全球约有新发结核病例1000万人,因结核病死亡150万余人,其中80%以上为肺结核^([1])。肺结核被定义为由结核分枝杆菌感染肺部引起的慢性感染性疾病,可出现咳嗽、咳痰、咯血、胸痛、气急等呼吸系统症状以及盗汗、潮热、消瘦等全身中毒症状。肺部影像学表现多样,其中空洞改变比较常见,空洞也是用于评估传染性和判断预后的指标之一。

关键词：肺结核空洞畲医药化瘀消痈炎症标记物

A plasma equilibrium model for rapid estimation of SF-MPDT performance

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Plasma Science and Technology 2021年第10期23卷 40-48页

作者： Yifeng Fu Cheng Zhou Peng Wu Zhongkai zhang zun zhang Haibin Tang School of Space and Environment Beihang UniversityBeijing 100191People's Republic of China Beijing Institute of Control Engineering Beijing 100094People’s Republic of China School of Astronautics Beihang UniversityBeijing 100191People’s Republic of China Key Laboratory of Spacecraft Design Optimization&Dynamic Simulation Technologies Ministry of EducationBeijing 100083People’s Republic of China Laboratory of Space Environment Monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing 100083People's Republic of China

In this work, a zero-dimensional plasma model for self-field magnetoplasmadynamic thrusters(SF-MPDTs) is proposed, which is based on the ion-number balance equation and energy balance equation, and can calculate the average electron temperature and the average ion temperature inside the discharge chamber conveniently. At the same time, the model can also predict the thruster performance, and the thruster performance predicted by the model is compared with experimental results, which proved the reliability of the model.

关键词： SF-MPDT plasma equilibrium diffusion equation thruster parameters

Splenectomy may facilitate systemic therapy for advanced hepatocellular carcinoma with hypersplenism

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Hepatobiliary Surgery and Nutrition 2023年第1期12卷 137-139页

作者： Er-Lei zhang zun-Yi zhang Zhi-Yong Huang Hepatic Surgery Center Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina

Hepatocellular carcinoma(HCC)is the second leading cause of cancer-related deaths globally and is widely considered to be a serious threat to human *** clinical settings,more than 70%of HCCs are unresectable at initial diagnosis and are therefore treated with palliative rather than curative treatment,which severely reduces the overall survival of HCC patients(1).

关键词： diagnosis carcinoma curative

A sensitive SYBR Green RT-qPCR method for grapevine virus E and its application for virus detection in different grapevine sample types

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Journal of Integrative Agriculture 2020年第7期19卷 1834-1841页

作者： REN Fang zhang zun-ping FAN Xu-dong HU Guo-jun zhang Meng-yan DONG Ya-feng National Center for Eliminating Viruses from Deciduous Fruit Trees Research Institute of PomologyChinese Academy of Agricultural SciencesXingcheng 125100P.R.China

To develop a rapid and high-sensitivity method for detection of grapevine virus E(GVE),a SYBR Green based real-time fluorescence quantitative RT-PCR method(RT-qPCR)was *** method could be used to detect GVE specifically,and the sensitivity was about 100 times greater than conventional *** excellent linear correlation(R=0.997)and a high amplification efficiency(E=97.5%)were obtained from the standard curve of this *** tests revealed that the coefficients of variation in the intra-and inter-assay results were 0.31-1.03%and 0.82--262%,respectively,indicating a good *** RT-qPCR method could be used to detect GVE in a wide range of grapevine sample *** detection rates of RT-qPCR for nearly all sample types from different positions and seasons were higher than conventional *** detection rates in spring,summer,autumn and winter increased *** in autumn and winter were best for detection,and the detection rates of most samples were 80-100%,which were 10 to 40%higher than conventional *** general,old petioles and branches were the best tissues for GVE *** detection rates of these samples in each season were all 100%,which were 20 to 40%higher than conventional *** second highest rates were in the old leaf,with detection rates for RT-qPCR of 80-100%in all seasons,which were 20 to 40%higher than conventional *** could be difficultly detected in young leaves by conventional RT-PCR,and the detection rates were only 0-50%,while by RT-qPCR the rates could increase to 0--80%.A total of 33 out of 363 samples(belonging to 68 cultivars)from 20 regions in China were detected to be positive by RT-qPCR(9.1%),which was more than twice the rate of the conventional RT-PCR(3.9%).

关键词： grapevine grapevine virus E detection RT-qPCR conventional RT-PCR